To reduce study you can play things like the London, the queen's gambit declined and the Scandinavian.
KID / KIA combo would require a lot of theory... but if you enjoy those positions then IMO it doesn't really matter. Playing whatever you enjoy could be considered a practical answer in its own way.
I tend to play the KID naturally as black i've even beaten my coach once with it so that's why i play it. I don't get bogged down by theory as it is my natural game.
I saw a game in the Tromposwsky actually it was a guess the move training exercise on chesstempo.com and i thought it is a very natural opening to play
Yeah, I think the tompowski is a good practical choice. It's not a bad opening at all, plus you get to play it on move 2 so black doesn't have a chance to avoid it (as long as he played Nf6).
I'm thinking Trompowsky or Torre Attack as White and Sicilian and KID as Black.